I have the following ruby filter:
convert => ["body_size", "integer"]
convert => ["header_size", "integer"]
# Sum of body and header size
code => "event.set('bytes', (event.get('body_size') + event.get('header_size')))"
Where body_size or header_size can be 0, but in those case, I get the following error:
Ruby exception occurred: undefined method+' for nil:NilClass`
How can I avoid that error and ensure that I get the sum of the field, even if there are 0?
The problem isn't that there is 0 values, it's that some document that go through this filter doesn't have the 'body_size' or header_size field.
Either filter before to be sure that this field exists:
Or you do it in ruby and all doc that go through this will have the field bytes. For ruby, you can do this:
code => "
sum = ( (event.get('body_size') != nil)?event.get('body_size') :0)+ ( (event.get('header_size') != nil)?event.get('body_size') :0)
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